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samples: bpf: Convert xdp_router_ipv4 to XDP samples helper
Rely on the libbpf skeleton facility and other utilities provided by XDP sample helpers in xdp_router_ipv4 sample. Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/7f4d98ee2c13c04d5eb924eebf79ced32fee8418.1647414711.git.lorenzo@kernel.org
This commit is contained in:
Lorenzo Bianconi
Andrii Nakryiko
parent
66df0fdb59
commit
85bf1f5169
@ -96,7 +96,6 @@ test_cgrp2_sock2-objs := test_cgrp2_sock2.o
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xdp1-objs := xdp1_user.o
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# reuse xdp1 source intentionally
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xdp2-objs := xdp1_user.o
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xdp_router_ipv4-objs := xdp_router_ipv4_user.o
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test_current_task_under_cgroup-objs := $(CGROUP_HELPERS) \
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test_current_task_under_cgroup_user.o
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trace_event-objs := trace_event_user.o $(TRACE_HELPERS)
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@ -124,6 +123,7 @@ xdp_redirect_cpu-objs := xdp_redirect_cpu_user.o $(XDP_SAMPLE)
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xdp_redirect_map-objs := xdp_redirect_map_user.o $(XDP_SAMPLE)
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xdp_redirect-objs := xdp_redirect_user.o $(XDP_SAMPLE)
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xdp_monitor-objs := xdp_monitor_user.o $(XDP_SAMPLE)
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xdp_router_ipv4-objs := xdp_router_ipv4_user.o $(XDP_SAMPLE)
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# Tell kbuild to always build the programs
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always-y := $(tprogs-y)
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@ -153,7 +153,6 @@ always-y += parse_varlen.o parse_simple.o parse_ldabs.o
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always-y += test_cgrp2_tc_kern.o
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always-y += xdp1_kern.o
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always-y += xdp2_kern.o
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always-y += xdp_router_ipv4_kern.o
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always-y += test_current_task_under_cgroup_kern.o
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always-y += trace_event_kern.o
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always-y += sampleip_kern.o
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@ -342,6 +341,7 @@ $(obj)/xdp_redirect_map_multi_user.o: $(obj)/xdp_redirect_map_multi.skel.h
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$(obj)/xdp_redirect_map_user.o: $(obj)/xdp_redirect_map.skel.h
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$(obj)/xdp_redirect_user.o: $(obj)/xdp_redirect.skel.h
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$(obj)/xdp_monitor_user.o: $(obj)/xdp_monitor.skel.h
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$(obj)/xdp_router_ipv4_user.o: $(obj)/xdp_router_ipv4.skel.h
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$(obj)/tracex5_kern.o: $(obj)/syscall_nrs.h
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$(obj)/hbm_out_kern.o: $(src)/hbm.h $(src)/hbm_kern.h
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@ -399,6 +399,7 @@ $(obj)/xdp_redirect_map_multi.bpf.o: $(obj)/xdp_sample.bpf.o
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$(obj)/xdp_redirect_map.bpf.o: $(obj)/xdp_sample.bpf.o
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$(obj)/xdp_redirect.bpf.o: $(obj)/xdp_sample.bpf.o
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$(obj)/xdp_monitor.bpf.o: $(obj)/xdp_sample.bpf.o
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$(obj)/xdp_router_ipv4.bpf.o: $(obj)/xdp_sample.bpf.o
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$(obj)/%.bpf.o: $(src)/%.bpf.c $(obj)/vmlinux.h $(src)/xdp_sample.bpf.h $(src)/xdp_sample_shared.h
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@echo " CLANG-BPF " $@
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@ -409,7 +410,8 @@ $(obj)/%.bpf.o: $(src)/%.bpf.c $(obj)/vmlinux.h $(src)/xdp_sample.bpf.h $(src)/x
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-c $(filter %.bpf.c,$^) -o $@
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LINKED_SKELS := xdp_redirect_cpu.skel.h xdp_redirect_map_multi.skel.h \
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xdp_redirect_map.skel.h xdp_redirect.skel.h xdp_monitor.skel.h
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xdp_redirect_map.skel.h xdp_redirect.skel.h xdp_monitor.skel.h \
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xdp_router_ipv4.skel.h
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clean-files += $(LINKED_SKELS)
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xdp_redirect_cpu.skel.h-deps := xdp_redirect_cpu.bpf.o xdp_sample.bpf.o
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@ -417,6 +419,7 @@ xdp_redirect_map_multi.skel.h-deps := xdp_redirect_map_multi.bpf.o xdp_sample.bp
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xdp_redirect_map.skel.h-deps := xdp_redirect_map.bpf.o xdp_sample.bpf.o
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xdp_redirect.skel.h-deps := xdp_redirect.bpf.o xdp_sample.bpf.o
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xdp_monitor.skel.h-deps := xdp_monitor.bpf.o xdp_sample.bpf.o
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xdp_router_ipv4.skel.h-deps := xdp_router_ipv4.bpf.o xdp_sample.bpf.o
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LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach skel,$(LINKED_SKELS),$($(skel)-deps)))
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180
samples/bpf/xdp_router_ipv4.bpf.c
Normal file
180
samples/bpf/xdp_router_ipv4.bpf.c
Normal file
@ -0,0 +1,180 @@
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/* Copyright (C) 2017 Cavium, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*/
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#include "vmlinux.h"
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#include "xdp_sample.bpf.h"
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#include "xdp_sample_shared.h"
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#define ETH_ALEN 6
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#define ETH_P_8021Q 0x8100
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#define ETH_P_8021AD 0x88A8
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struct trie_value {
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__u8 prefix[4];
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__be64 value;
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int ifindex;
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int metric;
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__be32 gw;
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};
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/* Key for lpm_trie */
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union key_4 {
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u32 b32[2];
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u8 b8[8];
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};
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struct arp_entry {
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__be64 mac;
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__be32 dst;
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};
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struct direct_map {
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struct arp_entry arp;
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int ifindex;
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__be64 mac;
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};
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/* Map for trie implementation */
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struct {
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__uint(type, BPF_MAP_TYPE_LPM_TRIE);
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__uint(key_size, 8);
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__uint(value_size, sizeof(struct trie_value));
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__uint(max_entries, 50);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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} lpm_map SEC(".maps");
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/* Map for ARP table */
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, __be32);
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__type(value, __be64);
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__uint(max_entries, 50);
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} arp_table SEC(".maps");
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/* Map to keep the exact match entries in the route table */
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, __be32);
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__type(value, struct direct_map);
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__uint(max_entries, 50);
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} exact_match SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_DEVMAP);
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__uint(key_size, sizeof(int));
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__uint(value_size, sizeof(int));
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__uint(max_entries, 100);
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} tx_port SEC(".maps");
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SEC("xdp")
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int xdp_router_ipv4_prog(struct xdp_md *ctx)
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{
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void *data_end = (void *)(long)ctx->data_end;
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void *data = (void *)(long)ctx->data;
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struct ethhdr *eth = data;
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u64 nh_off = sizeof(*eth);
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struct datarec *rec;
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__be16 h_proto;
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u32 key = 0;
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rec = bpf_map_lookup_elem(&rx_cnt, &key);
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if (rec)
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NO_TEAR_INC(rec->processed);
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if (data + nh_off > data_end)
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goto drop;
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h_proto = eth->h_proto;
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if (h_proto == bpf_htons(ETH_P_8021Q) ||
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h_proto == bpf_htons(ETH_P_8021AD)) {
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struct vlan_hdr *vhdr;
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vhdr = data + nh_off;
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nh_off += sizeof(struct vlan_hdr);
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if (data + nh_off > data_end)
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goto drop;
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h_proto = vhdr->h_vlan_encapsulated_proto;
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}
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switch (bpf_ntohs(h_proto)) {
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case ETH_P_ARP:
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if (rec)
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NO_TEAR_INC(rec->xdp_pass);
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return XDP_PASS;
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case ETH_P_IP: {
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struct iphdr *iph = data + nh_off;
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struct direct_map *direct_entry;
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__be64 *dest_mac, *src_mac;
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int forward_to;
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if (iph + 1 > data_end)
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goto drop;
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direct_entry = bpf_map_lookup_elem(&exact_match, &iph->daddr);
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/* Check for exact match, this would give a faster lookup */
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if (direct_entry && direct_entry->mac &&
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direct_entry->arp.mac) {
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src_mac = &direct_entry->mac;
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dest_mac = &direct_entry->arp.mac;
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forward_to = direct_entry->ifindex;
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} else {
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struct trie_value *prefix_value;
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union key_4 key4;
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/* Look up in the trie for lpm */
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key4.b32[0] = 32;
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key4.b8[4] = iph->daddr & 0xff;
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key4.b8[5] = (iph->daddr >> 8) & 0xff;
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key4.b8[6] = (iph->daddr >> 16) & 0xff;
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key4.b8[7] = (iph->daddr >> 24) & 0xff;
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prefix_value = bpf_map_lookup_elem(&lpm_map, &key4);
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if (!prefix_value)
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goto drop;
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forward_to = prefix_value->ifindex;
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src_mac = &prefix_value->value;
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if (!src_mac)
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goto drop;
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dest_mac = bpf_map_lookup_elem(&arp_table, &iph->daddr);
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if (!dest_mac) {
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if (!prefix_value->gw)
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goto drop;
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dest_mac = bpf_map_lookup_elem(&arp_table,
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&prefix_value->gw);
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}
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}
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if (src_mac && dest_mac) {
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int ret;
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__builtin_memcpy(eth->h_dest, dest_mac, ETH_ALEN);
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__builtin_memcpy(eth->h_source, src_mac, ETH_ALEN);
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ret = bpf_redirect_map(&tx_port, forward_to, 0);
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if (ret == XDP_REDIRECT) {
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if (rec)
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NO_TEAR_INC(rec->xdp_redirect);
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return ret;
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}
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}
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}
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default:
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break;
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}
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drop:
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if (rec)
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NO_TEAR_INC(rec->xdp_drop);
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return XDP_DROP;
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}
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char _license[] SEC("license") = "GPL";
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@ -1,186 +0,0 @@
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/* Copyright (C) 2017 Cavium, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*/
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#define KBUILD_MODNAME "foo"
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#include <uapi/linux/bpf.h>
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#include <linux/in.h>
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#include <linux/if_ether.h>
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#include <linux/if_packet.h>
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <bpf/bpf_helpers.h>
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#include <linux/slab.h>
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#include <net/ip_fib.h>
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struct trie_value {
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__u8 prefix[4];
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__be64 value;
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int ifindex;
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int metric;
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__be32 gw;
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};
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/* Key for lpm_trie*/
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union key_4 {
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u32 b32[2];
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u8 b8[8];
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};
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struct arp_entry {
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__be64 mac;
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__be32 dst;
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};
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struct direct_map {
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struct arp_entry arp;
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int ifindex;
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__be64 mac;
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};
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/* Map for trie implementation*/
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struct {
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__uint(type, BPF_MAP_TYPE_LPM_TRIE);
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__uint(key_size, 8);
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__uint(value_size, sizeof(struct trie_value));
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__uint(max_entries, 50);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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} lpm_map SEC(".maps");
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/* Map for counter*/
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__type(key, u32);
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__type(value, u64);
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__uint(max_entries, 256);
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} rxcnt SEC(".maps");
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/* Map for ARP table*/
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, __be32);
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__type(value, __be64);
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__uint(max_entries, 50);
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} arp_table SEC(".maps");
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/* Map to keep the exact match entries in the route table*/
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, __be32);
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__type(value, struct direct_map);
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__uint(max_entries, 50);
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} exact_match SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_DEVMAP);
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__uint(key_size, sizeof(int));
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__uint(value_size, sizeof(int));
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__uint(max_entries, 100);
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} tx_port SEC(".maps");
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/* Function to set source and destination mac of the packet */
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static inline void set_src_dst_mac(void *data, void *src, void *dst)
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{
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unsigned short *source = src;
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unsigned short *dest = dst;
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unsigned short *p = data;
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__builtin_memcpy(p, dest, 6);
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__builtin_memcpy(p + 3, source, 6);
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}
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/* Parse IPV4 packet to get SRC, DST IP and protocol */
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static inline int parse_ipv4(void *data, u64 nh_off, void *data_end,
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__be32 *src, __be32 *dest)
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{
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struct iphdr *iph = data + nh_off;
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if (iph + 1 > data_end)
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return 0;
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*src = iph->saddr;
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*dest = iph->daddr;
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return iph->protocol;
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}
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SEC("xdp_router_ipv4")
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int xdp_router_ipv4_prog(struct xdp_md *ctx)
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{
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void *data_end = (void *)(long)ctx->data_end;
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__be64 *dest_mac = NULL, *src_mac = NULL;
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void *data = (void *)(long)ctx->data;
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struct trie_value *prefix_value;
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int rc = XDP_DROP, forward_to;
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struct ethhdr *eth = data;
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union key_4 key4;
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long *value;
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u16 h_proto;
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u32 ipproto;
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u64 nh_off;
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nh_off = sizeof(*eth);
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if (data + nh_off > data_end)
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return rc;
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h_proto = eth->h_proto;
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if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
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struct vlan_hdr *vhdr;
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vhdr = data + nh_off;
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nh_off += sizeof(struct vlan_hdr);
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if (data + nh_off > data_end)
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return rc;
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h_proto = vhdr->h_vlan_encapsulated_proto;
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}
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if (h_proto == htons(ETH_P_ARP)) {
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return XDP_PASS;
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} else if (h_proto == htons(ETH_P_IP)) {
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struct direct_map *direct_entry;
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__be32 src_ip = 0, dest_ip = 0;
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ipproto = parse_ipv4(data, nh_off, data_end, &src_ip, &dest_ip);
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direct_entry = bpf_map_lookup_elem(&exact_match, &dest_ip);
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/* Check for exact match, this would give a faster lookup*/
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if (direct_entry && direct_entry->mac && direct_entry->arp.mac) {
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src_mac = &direct_entry->mac;
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dest_mac = &direct_entry->arp.mac;
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forward_to = direct_entry->ifindex;
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} else {
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/* Look up in the trie for lpm*/
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key4.b32[0] = 32;
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key4.b8[4] = dest_ip & 0xff;
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key4.b8[5] = (dest_ip >> 8) & 0xff;
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key4.b8[6] = (dest_ip >> 16) & 0xff;
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key4.b8[7] = (dest_ip >> 24) & 0xff;
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prefix_value = bpf_map_lookup_elem(&lpm_map, &key4);
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if (!prefix_value)
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return XDP_DROP;
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src_mac = &prefix_value->value;
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if (!src_mac)
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return XDP_DROP;
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dest_mac = bpf_map_lookup_elem(&arp_table, &dest_ip);
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if (!dest_mac) {
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if (!prefix_value->gw)
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return XDP_DROP;
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dest_ip = prefix_value->gw;
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dest_mac = bpf_map_lookup_elem(&arp_table, &dest_ip);
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}
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forward_to = prefix_value->ifindex;
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}
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} else {
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ipproto = 0;
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}
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if (src_mac && dest_mac) {
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set_src_dst_mac(data, src_mac, dest_mac);
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value = bpf_map_lookup_elem(&rxcnt, &ipproto);
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if (value)
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*value += 1;
|
||||
return bpf_redirect_map(&tx_port, forward_to, 0);
|
||||
}
|
||||
return rc;
|
||||
}
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
@ -24,70 +24,36 @@
|
||||
#include <bpf/libbpf.h>
|
||||
#include <sys/resource.h>
|
||||
#include <libgen.h>
|
||||
#include <getopt.h>
|
||||
#include "xdp_sample_user.h"
|
||||
#include "xdp_router_ipv4.skel.h"
|
||||
|
||||
int sock, sock_arp, flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
|
||||
static int total_ifindex;
|
||||
static int *ifindex_list;
|
||||
static __u32 *prog_id_list;
|
||||
char buf[8192];
|
||||
static const char *__doc__ =
|
||||
"XDP IPv4 router implementation\n"
|
||||
"Usage: xdp_router_ipv4 <IFNAME-0> ... <IFNAME-N>\n";
|
||||
|
||||
static char buf[8192];
|
||||
static int lpm_map_fd;
|
||||
static int rxcnt_map_fd;
|
||||
static int arp_table_map_fd;
|
||||
static int exact_match_map_fd;
|
||||
static int tx_port_map_fd;
|
||||
|
||||
static int mask = SAMPLE_RX_CNT | SAMPLE_REDIRECT_ERR_MAP_CNT |
|
||||
SAMPLE_DEVMAP_XMIT_CNT_MULTI | SAMPLE_EXCEPTION_CNT;
|
||||
|
||||
DEFINE_SAMPLE_INIT(xdp_router_ipv4);
|
||||
|
||||
static const struct option long_options[] = {
|
||||
{ "help", no_argument, NULL, 'h' },
|
||||
{ "skb-mode", no_argument, NULL, 'S' },
|
||||
{ "force", no_argument, NULL, 'F' },
|
||||
{ "interval", required_argument, NULL, 'i' },
|
||||
{ "verbose", no_argument, NULL, 'v' },
|
||||
{ "stats", no_argument, NULL, 's' },
|
||||
{}
|
||||
};
|
||||
|
||||
static int get_route_table(int rtm_family);
|
||||
static void int_exit(int sig)
|
||||
{
|
||||
__u32 prog_id = 0;
|
||||
int i = 0;
|
||||
|
||||
for (i = 0; i < total_ifindex; i++) {
|
||||
if (bpf_xdp_query_id(ifindex_list[i], flags, &prog_id)) {
|
||||
printf("bpf_xdp_query_id on iface %d failed\n",
|
||||
ifindex_list[i]);
|
||||
exit(1);
|
||||
}
|
||||
if (prog_id_list[i] == prog_id)
|
||||
bpf_xdp_detach(ifindex_list[i], flags, NULL);
|
||||
else if (!prog_id)
|
||||
printf("couldn't find a prog id on iface %d\n",
|
||||
ifindex_list[i]);
|
||||
else
|
||||
printf("program on iface %d changed, not removing\n",
|
||||
ifindex_list[i]);
|
||||
prog_id = 0;
|
||||
}
|
||||
exit(0);
|
||||
}
|
||||
|
||||
static void close_and_exit(int sig)
|
||||
{
|
||||
close(sock);
|
||||
close(sock_arp);
|
||||
|
||||
int_exit(0);
|
||||
}
|
||||
|
||||
/* Get the mac address of the interface given interface name */
|
||||
static __be64 getmac(char *iface)
|
||||
{
|
||||
struct ifreq ifr;
|
||||
__be64 mac = 0;
|
||||
int fd, i;
|
||||
|
||||
fd = socket(AF_INET, SOCK_DGRAM, 0);
|
||||
ifr.ifr_addr.sa_family = AF_INET;
|
||||
strncpy(ifr.ifr_name, iface, IFNAMSIZ - 1);
|
||||
if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) {
|
||||
printf("ioctl failed leaving....\n");
|
||||
return -1;
|
||||
}
|
||||
for (i = 0; i < 6 ; i++)
|
||||
*((__u8 *)&mac + i) = (__u8)ifr.ifr_hwaddr.sa_data[i];
|
||||
close(fd);
|
||||
return mac;
|
||||
}
|
||||
|
||||
static int recv_msg(struct sockaddr_nl sock_addr, int sock)
|
||||
{
|
||||
@ -130,7 +96,6 @@ static void read_route(struct nlmsghdr *nh, int nll)
|
||||
int i;
|
||||
struct route_table {
|
||||
int dst_len, iface, metric;
|
||||
char *iface_name;
|
||||
__be32 dst, gw;
|
||||
__be64 mac;
|
||||
} route;
|
||||
@ -145,17 +110,7 @@ static void read_route(struct nlmsghdr *nh, int nll)
|
||||
__be64 mac;
|
||||
} direct_entry;
|
||||
|
||||
if (nh->nlmsg_type == RTM_DELROUTE)
|
||||
printf("DELETING Route entry\n");
|
||||
else if (nh->nlmsg_type == RTM_GETROUTE)
|
||||
printf("READING Route entry\n");
|
||||
else if (nh->nlmsg_type == RTM_NEWROUTE)
|
||||
printf("NEW Route entry\n");
|
||||
else
|
||||
printf("%d\n", nh->nlmsg_type);
|
||||
|
||||
memset(&route, 0, sizeof(route));
|
||||
printf("Destination Gateway Genmask Metric Iface\n");
|
||||
for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
|
||||
rt_msg = (struct rtmsg *)NLMSG_DATA(nh);
|
||||
rtm_family = rt_msg->rtm_family;
|
||||
@ -192,11 +147,7 @@ static void read_route(struct nlmsghdr *nh, int nll)
|
||||
route.gw = atoi(gws);
|
||||
route.iface = atoi(ifs);
|
||||
route.metric = atoi(metrics);
|
||||
route.iface_name = alloca(sizeof(char *) * IFNAMSIZ);
|
||||
route.iface_name = if_indextoname(route.iface, route.iface_name);
|
||||
route.mac = getmac(route.iface_name);
|
||||
if (route.mac == -1)
|
||||
int_exit(0);
|
||||
assert(get_mac_addr(route.iface, &route.mac) == 0);
|
||||
assert(bpf_map_update_elem(tx_port_map_fd,
|
||||
&route.iface, &route.iface, 0) == 0);
|
||||
if (rtm_family == AF_INET) {
|
||||
@ -207,7 +158,6 @@ static void read_route(struct nlmsghdr *nh, int nll)
|
||||
int metric;
|
||||
__be32 gw;
|
||||
} *prefix_value;
|
||||
struct in_addr dst_addr, gw_addr, mask_addr;
|
||||
|
||||
prefix_key = alloca(sizeof(*prefix_key) + 3);
|
||||
prefix_value = alloca(sizeof(*prefix_value));
|
||||
@ -235,17 +185,6 @@ static void read_route(struct nlmsghdr *nh, int nll)
|
||||
for (i = 0; i < 4; i++)
|
||||
prefix_key->data[i] = (route.dst >> i * 8) & 0xff;
|
||||
|
||||
dst_addr.s_addr = route.dst;
|
||||
printf("%-16s", inet_ntoa(dst_addr));
|
||||
|
||||
gw_addr.s_addr = route.gw;
|
||||
printf("%-16s", inet_ntoa(gw_addr));
|
||||
|
||||
mask_addr.s_addr = htonl(~(0xffffffffU >> route.dst_len));
|
||||
printf("%-16s%-7d%s\n", inet_ntoa(mask_addr),
|
||||
route.metric,
|
||||
route.iface_name);
|
||||
|
||||
if (bpf_map_lookup_elem(lpm_map_fd, prefix_key,
|
||||
prefix_value) < 0) {
|
||||
for (i = 0; i < 4; i++)
|
||||
@ -261,13 +200,6 @@ static void read_route(struct nlmsghdr *nh, int nll)
|
||||
) == 0);
|
||||
} else {
|
||||
if (nh->nlmsg_type == RTM_DELROUTE) {
|
||||
printf("deleting entry\n");
|
||||
printf("prefix key=%d.%d.%d.%d/%d",
|
||||
prefix_key->data[0],
|
||||
prefix_key->data[1],
|
||||
prefix_key->data[2],
|
||||
prefix_key->data[3],
|
||||
prefix_key->prefixlen);
|
||||
assert(bpf_map_delete_elem(lpm_map_fd,
|
||||
prefix_key
|
||||
) == 0);
|
||||
@ -331,14 +263,14 @@ static int get_route_table(int rtm_family)
|
||||
|
||||
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
||||
if (sock < 0) {
|
||||
printf("open netlink socket: %s\n", strerror(errno));
|
||||
return -1;
|
||||
fprintf(stderr, "open netlink socket: %s\n", strerror(errno));
|
||||
return -errno;
|
||||
}
|
||||
memset(&sa, 0, sizeof(sa));
|
||||
sa.nl_family = AF_NETLINK;
|
||||
if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
|
||||
printf("bind to netlink: %s\n", strerror(errno));
|
||||
ret = -1;
|
||||
fprintf(stderr, "bind netlink socket: %s\n", strerror(errno));
|
||||
ret = -errno;
|
||||
goto cleanup;
|
||||
}
|
||||
memset(&req, 0, sizeof(req));
|
||||
@ -357,15 +289,15 @@ static int get_route_table(int rtm_family)
|
||||
msg.msg_iovlen = 1;
|
||||
ret = sendmsg(sock, &msg, 0);
|
||||
if (ret < 0) {
|
||||
printf("send to netlink: %s\n", strerror(errno));
|
||||
ret = -1;
|
||||
fprintf(stderr, "send to netlink: %s\n", strerror(errno));
|
||||
ret = -errno;
|
||||
goto cleanup;
|
||||
}
|
||||
memset(buf, 0, sizeof(buf));
|
||||
nll = recv_msg(sa, sock);
|
||||
if (nll < 0) {
|
||||
printf("recv from netlink: %s\n", strerror(nll));
|
||||
ret = -1;
|
||||
fprintf(stderr, "recv from netlink: %s\n", strerror(nll));
|
||||
ret = nll;
|
||||
goto cleanup;
|
||||
}
|
||||
nh = (struct nlmsghdr *)buf;
|
||||
@ -395,14 +327,7 @@ static void read_arp(struct nlmsghdr *nh, int nll)
|
||||
__be64 mac;
|
||||
} direct_entry;
|
||||
|
||||
if (nh->nlmsg_type == RTM_GETNEIGH)
|
||||
printf("READING arp entry\n");
|
||||
printf("Address HwAddress\n");
|
||||
for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) {
|
||||
struct in_addr dst_addr;
|
||||
char mac_str[18];
|
||||
int len = 0, i;
|
||||
|
||||
rt_msg = (struct ndmsg *)NLMSG_DATA(nh);
|
||||
rt_attr = (struct rtattr *)RTM_RTA(rt_msg);
|
||||
ndm_family = rt_msg->ndm_family;
|
||||
@ -424,13 +349,6 @@ static void read_arp(struct nlmsghdr *nh, int nll)
|
||||
arp_entry.dst = atoi(dsts);
|
||||
arp_entry.mac = atol(mac);
|
||||
|
||||
dst_addr.s_addr = arp_entry.dst;
|
||||
for (i = 0; i < 6; i++)
|
||||
len += snprintf(mac_str + len, 18 - len, "%02llx%s",
|
||||
((arp_entry.mac >> i * 8) & 0xff),
|
||||
i < 5 ? ":" : "");
|
||||
printf("%-16s%s\n", inet_ntoa(dst_addr), mac_str);
|
||||
|
||||
if (ndm_family == AF_INET) {
|
||||
if (bpf_map_lookup_elem(exact_match_map_fd,
|
||||
&arp_entry.dst,
|
||||
@ -481,14 +399,14 @@ static int get_arp_table(int rtm_family)
|
||||
|
||||
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
||||
if (sock < 0) {
|
||||
printf("open netlink socket: %s\n", strerror(errno));
|
||||
return -1;
|
||||
fprintf(stderr, "open netlink socket: %s\n", strerror(errno));
|
||||
return -errno;
|
||||
}
|
||||
memset(&sa, 0, sizeof(sa));
|
||||
sa.nl_family = AF_NETLINK;
|
||||
if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
|
||||
printf("bind to netlink: %s\n", strerror(errno));
|
||||
ret = -1;
|
||||
fprintf(stderr, "bind netlink socket: %s\n", strerror(errno));
|
||||
ret = -errno;
|
||||
goto cleanup;
|
||||
}
|
||||
memset(&req, 0, sizeof(req));
|
||||
@ -506,15 +424,15 @@ static int get_arp_table(int rtm_family)
|
||||
msg.msg_iovlen = 1;
|
||||
ret = sendmsg(sock, &msg, 0);
|
||||
if (ret < 0) {
|
||||
printf("send to netlink: %s\n", strerror(errno));
|
||||
ret = -1;
|
||||
fprintf(stderr, "send to netlink: %s\n", strerror(errno));
|
||||
ret = -errno;
|
||||
goto cleanup;
|
||||
}
|
||||
memset(buf, 0, sizeof(buf));
|
||||
nll = recv_msg(sa, sock);
|
||||
if (nll < 0) {
|
||||
printf("recv from netlink: %s\n", strerror(nll));
|
||||
ret = -1;
|
||||
fprintf(stderr, "recv from netlink: %s\n", strerror(nll));
|
||||
ret = nll;
|
||||
goto cleanup;
|
||||
}
|
||||
nh = (struct nlmsghdr *)buf;
|
||||
@ -527,24 +445,17 @@ cleanup:
|
||||
/* Function to keep track and update changes in route and arp table
|
||||
* Give regular statistics of packets forwarded
|
||||
*/
|
||||
static int monitor_route(void)
|
||||
static void monitor_route(void *ctx)
|
||||
{
|
||||
unsigned int nr_cpus = bpf_num_possible_cpus();
|
||||
const unsigned int nr_keys = 256;
|
||||
struct pollfd fds_route, fds_arp;
|
||||
__u64 prev[nr_keys][nr_cpus];
|
||||
struct sockaddr_nl la, lr;
|
||||
__u64 values[nr_cpus];
|
||||
int sock, sock_arp, nll;
|
||||
struct nlmsghdr *nh;
|
||||
int nll, ret = 0;
|
||||
int interval = 5;
|
||||
__u32 key;
|
||||
int i;
|
||||
|
||||
sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
||||
if (sock < 0) {
|
||||
printf("open netlink socket: %s\n", strerror(errno));
|
||||
return -1;
|
||||
fprintf(stderr, "open netlink socket: %s\n", strerror(errno));
|
||||
return;
|
||||
}
|
||||
|
||||
fcntl(sock, F_SETFL, O_NONBLOCK);
|
||||
@ -552,17 +463,19 @@ static int monitor_route(void)
|
||||
lr.nl_family = AF_NETLINK;
|
||||
lr.nl_groups = RTMGRP_IPV6_ROUTE | RTMGRP_IPV4_ROUTE | RTMGRP_NOTIFY;
|
||||
if (bind(sock, (struct sockaddr *)&lr, sizeof(lr)) < 0) {
|
||||
printf("bind to netlink: %s\n", strerror(errno));
|
||||
ret = -1;
|
||||
goto cleanup;
|
||||
fprintf(stderr, "bind netlink socket: %s\n", strerror(errno));
|
||||
close(sock);
|
||||
return;
|
||||
}
|
||||
|
||||
fds_route.fd = sock;
|
||||
fds_route.events = POLL_IN;
|
||||
|
||||
sock_arp = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
||||
if (sock_arp < 0) {
|
||||
printf("open netlink socket: %s\n", strerror(errno));
|
||||
return -1;
|
||||
fprintf(stderr, "open netlink socket: %s\n", strerror(errno));
|
||||
close(sock);
|
||||
return;
|
||||
}
|
||||
|
||||
fcntl(sock_arp, F_SETFL, O_NONBLOCK);
|
||||
@ -570,184 +483,196 @@ static int monitor_route(void)
|
||||
la.nl_family = AF_NETLINK;
|
||||
la.nl_groups = RTMGRP_NEIGH | RTMGRP_NOTIFY;
|
||||
if (bind(sock_arp, (struct sockaddr *)&la, sizeof(la)) < 0) {
|
||||
printf("bind to netlink: %s\n", strerror(errno));
|
||||
ret = -1;
|
||||
fprintf(stderr, "bind netlink socket: %s\n", strerror(errno));
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
fds_arp.fd = sock_arp;
|
||||
fds_arp.events = POLL_IN;
|
||||
|
||||
memset(prev, 0, sizeof(prev));
|
||||
do {
|
||||
signal(SIGINT, close_and_exit);
|
||||
signal(SIGTERM, close_and_exit);
|
||||
|
||||
sleep(interval);
|
||||
for (key = 0; key < nr_keys; key++) {
|
||||
__u64 sum = 0;
|
||||
|
||||
assert(bpf_map_lookup_elem(rxcnt_map_fd,
|
||||
&key, values) == 0);
|
||||
for (i = 0; i < nr_cpus; i++)
|
||||
sum += (values[i] - prev[key][i]);
|
||||
if (sum)
|
||||
printf("proto %u: %10llu pkt/s\n",
|
||||
key, sum / interval);
|
||||
memcpy(prev[key], values, sizeof(values));
|
||||
memset(buf, 0, sizeof(buf));
|
||||
if (poll(&fds_route, 1, 3) == POLL_IN) {
|
||||
nll = recv_msg(lr, sock);
|
||||
if (nll < 0) {
|
||||
fprintf(stderr, "recv from netlink: %s\n",
|
||||
strerror(nll));
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
memset(buf, 0, sizeof(buf));
|
||||
if (poll(&fds_route, 1, 3) == POLL_IN) {
|
||||
nll = recv_msg(lr, sock);
|
||||
if (nll < 0) {
|
||||
printf("recv from netlink: %s\n", strerror(nll));
|
||||
ret = -1;
|
||||
goto cleanup;
|
||||
}
|
||||
nh = (struct nlmsghdr *)buf;
|
||||
read_route(nh, nll);
|
||||
}
|
||||
|
||||
nh = (struct nlmsghdr *)buf;
|
||||
printf("Routing table updated.\n");
|
||||
read_route(nh, nll);
|
||||
}
|
||||
memset(buf, 0, sizeof(buf));
|
||||
if (poll(&fds_arp, 1, 3) == POLL_IN) {
|
||||
nll = recv_msg(la, sock_arp);
|
||||
if (nll < 0) {
|
||||
printf("recv from netlink: %s\n", strerror(nll));
|
||||
ret = -1;
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
nh = (struct nlmsghdr *)buf;
|
||||
read_arp(nh, nll);
|
||||
memset(buf, 0, sizeof(buf));
|
||||
if (poll(&fds_arp, 1, 3) == POLL_IN) {
|
||||
nll = recv_msg(la, sock_arp);
|
||||
if (nll < 0) {
|
||||
fprintf(stderr, "recv from netlink: %s\n",
|
||||
strerror(nll));
|
||||
goto cleanup;
|
||||
}
|
||||
|
||||
} while (1);
|
||||
nh = (struct nlmsghdr *)buf;
|
||||
read_arp(nh, nll);
|
||||
}
|
||||
|
||||
cleanup:
|
||||
close(sock_arp);
|
||||
close(sock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void usage(const char *prog)
|
||||
static void usage(char *argv[], const struct option *long_options,
|
||||
const char *doc, int mask, bool error,
|
||||
struct bpf_object *obj)
|
||||
{
|
||||
fprintf(stderr,
|
||||
"%s: %s [OPTS] interface name list\n\n"
|
||||
"OPTS:\n"
|
||||
" -S use skb-mode\n"
|
||||
" -F force loading prog\n",
|
||||
__func__, prog);
|
||||
sample_usage(argv, long_options, doc, mask, error);
|
||||
}
|
||||
|
||||
int main(int ac, char **argv)
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
struct bpf_prog_info info = {};
|
||||
__u32 info_len = sizeof(info);
|
||||
const char *optstr = "SF";
|
||||
struct bpf_program *prog;
|
||||
struct bpf_object *obj;
|
||||
char filename[256];
|
||||
char **ifname_list;
|
||||
int prog_fd, opt;
|
||||
int err, i = 1;
|
||||
bool error = true, generic = false, force = false;
|
||||
int opt, interval = 5, ret = EXIT_FAIL_BPF;
|
||||
struct xdp_router_ipv4 *skel;
|
||||
int i, total_ifindex = argc - 1;
|
||||
char **ifname_list = argv + 1;
|
||||
int longindex = 0;
|
||||
|
||||
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
|
||||
if (libbpf_set_strict_mode(LIBBPF_STRICT_ALL) < 0) {
|
||||
fprintf(stderr, "Failed to set libbpf strict mode: %s\n",
|
||||
strerror(errno));
|
||||
goto end;
|
||||
}
|
||||
|
||||
total_ifindex = ac - 1;
|
||||
ifname_list = (argv + 1);
|
||||
skel = xdp_router_ipv4__open();
|
||||
if (!skel) {
|
||||
fprintf(stderr, "Failed to xdp_router_ipv4__open: %s\n",
|
||||
strerror(errno));
|
||||
goto end;
|
||||
}
|
||||
|
||||
while ((opt = getopt(ac, argv, optstr)) != -1) {
|
||||
ret = sample_init_pre_load(skel);
|
||||
if (ret < 0) {
|
||||
fprintf(stderr, "Failed to sample_init_pre_load: %s\n",
|
||||
strerror(-ret));
|
||||
ret = EXIT_FAIL_BPF;
|
||||
goto end_destroy;
|
||||
}
|
||||
|
||||
ret = xdp_router_ipv4__load(skel);
|
||||
if (ret < 0) {
|
||||
fprintf(stderr, "Failed to xdp_router_ipv4__load: %s\n",
|
||||
strerror(errno));
|
||||
goto end_destroy;
|
||||
}
|
||||
|
||||
ret = sample_init(skel, mask);
|
||||
if (ret < 0) {
|
||||
fprintf(stderr, "Failed to initialize sample: %s\n", strerror(-ret));
|
||||
ret = EXIT_FAIL;
|
||||
goto end_destroy;
|
||||
}
|
||||
|
||||
while ((opt = getopt_long(argc, argv, "si:SFvh",
|
||||
long_options, &longindex)) != -1) {
|
||||
switch (opt) {
|
||||
case 's':
|
||||
mask |= SAMPLE_REDIRECT_MAP_CNT;
|
||||
total_ifindex--;
|
||||
ifname_list++;
|
||||
break;
|
||||
case 'i':
|
||||
interval = strtoul(optarg, NULL, 0);
|
||||
total_ifindex -= 2;
|
||||
ifname_list += 2;
|
||||
break;
|
||||
case 'S':
|
||||
flags |= XDP_FLAGS_SKB_MODE;
|
||||
generic = true;
|
||||
total_ifindex--;
|
||||
ifname_list++;
|
||||
break;
|
||||
case 'F':
|
||||
flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST;
|
||||
force = true;
|
||||
total_ifindex--;
|
||||
ifname_list++;
|
||||
break;
|
||||
case 'v':
|
||||
sample_switch_mode();
|
||||
total_ifindex--;
|
||||
ifname_list++;
|
||||
break;
|
||||
case 'h':
|
||||
error = false;
|
||||
default:
|
||||
usage(basename(argv[0]));
|
||||
return 1;
|
||||
usage(argv, long_options, __doc__, mask, error, skel->obj);
|
||||
goto end_destroy;
|
||||
}
|
||||
}
|
||||
|
||||
if (!(flags & XDP_FLAGS_SKB_MODE))
|
||||
flags |= XDP_FLAGS_DRV_MODE;
|
||||
|
||||
if (optind == ac) {
|
||||
usage(basename(argv[0]));
|
||||
return 1;
|
||||
ret = EXIT_FAIL_OPTION;
|
||||
if (optind == argc) {
|
||||
usage(argv, long_options, __doc__, mask, true, skel->obj);
|
||||
goto end_destroy;
|
||||
}
|
||||
|
||||
obj = bpf_object__open_file(filename, NULL);
|
||||
if (libbpf_get_error(obj))
|
||||
return 1;
|
||||
|
||||
prog = bpf_object__next_program(obj, NULL);
|
||||
bpf_program__set_type(prog, BPF_PROG_TYPE_XDP);
|
||||
|
||||
printf("\n******************loading bpf file*********************\n");
|
||||
err = bpf_object__load(obj);
|
||||
if (err) {
|
||||
printf("bpf_object__load(): %s\n", strerror(errno));
|
||||
return 1;
|
||||
lpm_map_fd = bpf_map__fd(skel->maps.lpm_map);
|
||||
if (lpm_map_fd < 0) {
|
||||
fprintf(stderr, "Failed loading lpm_map %s\n",
|
||||
strerror(-lpm_map_fd));
|
||||
goto end_destroy;
|
||||
}
|
||||
prog_fd = bpf_program__fd(prog);
|
||||
|
||||
lpm_map_fd = bpf_object__find_map_fd_by_name(obj, "lpm_map");
|
||||
rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt");
|
||||
arp_table_map_fd = bpf_object__find_map_fd_by_name(obj, "arp_table");
|
||||
exact_match_map_fd = bpf_object__find_map_fd_by_name(obj,
|
||||
"exact_match");
|
||||
tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port");
|
||||
if (lpm_map_fd < 0 || rxcnt_map_fd < 0 || arp_table_map_fd < 0 ||
|
||||
exact_match_map_fd < 0 || tx_port_map_fd < 0) {
|
||||
printf("bpf_object__find_map_fd_by_name failed\n");
|
||||
return 1;
|
||||
arp_table_map_fd = bpf_map__fd(skel->maps.arp_table);
|
||||
if (arp_table_map_fd < 0) {
|
||||
fprintf(stderr, "Failed loading arp_table_map_fd %s\n",
|
||||
strerror(-arp_table_map_fd));
|
||||
goto end_destroy;
|
||||
}
|
||||
exact_match_map_fd = bpf_map__fd(skel->maps.exact_match);
|
||||
if (exact_match_map_fd < 0) {
|
||||
fprintf(stderr, "Failed loading exact_match_map_fd %s\n",
|
||||
strerror(-exact_match_map_fd));
|
||||
goto end_destroy;
|
||||
}
|
||||
tx_port_map_fd = bpf_map__fd(skel->maps.tx_port);
|
||||
if (tx_port_map_fd < 0) {
|
||||
fprintf(stderr, "Failed loading tx_port_map_fd %s\n",
|
||||
strerror(-tx_port_map_fd));
|
||||
goto end_destroy;
|
||||
}
|
||||
|
||||
ifindex_list = (int *)calloc(total_ifindex, sizeof(int *));
|
||||
ret = EXIT_FAIL_XDP;
|
||||
for (i = 0; i < total_ifindex; i++) {
|
||||
ifindex_list[i] = if_nametoindex(ifname_list[i]);
|
||||
if (!ifindex_list[i]) {
|
||||
printf("Couldn't translate interface name: %s",
|
||||
strerror(errno));
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
prog_id_list = (__u32 *)calloc(total_ifindex, sizeof(__u32 *));
|
||||
for (i = 0; i < total_ifindex; i++) {
|
||||
if (bpf_xdp_attach(ifindex_list[i], prog_fd, flags, NULL) < 0) {
|
||||
printf("link set xdp fd failed\n");
|
||||
int recovery_index = i;
|
||||
int index = if_nametoindex(ifname_list[i]);
|
||||
|
||||
for (i = 0; i < recovery_index; i++)
|
||||
bpf_xdp_detach(ifindex_list[i], flags, NULL);
|
||||
|
||||
return 1;
|
||||
if (!index) {
|
||||
fprintf(stderr, "Interface %s not found %s\n",
|
||||
ifname_list[i], strerror(-tx_port_map_fd));
|
||||
goto end_destroy;
|
||||
}
|
||||
err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);
|
||||
if (err) {
|
||||
printf("can't get prog info - %s\n", strerror(errno));
|
||||
return err;
|
||||
}
|
||||
prog_id_list[i] = info.id;
|
||||
memset(&info, 0, sizeof(info));
|
||||
printf("Attached to %d\n", ifindex_list[i]);
|
||||
}
|
||||
signal(SIGINT, int_exit);
|
||||
signal(SIGTERM, int_exit);
|
||||
|
||||
printf("\n*******************ROUTE TABLE*************************\n");
|
||||
get_route_table(AF_INET);
|
||||
printf("\n*******************ARP TABLE***************************\n");
|
||||
get_arp_table(AF_INET);
|
||||
if (monitor_route() < 0) {
|
||||
printf("Error in receiving route update");
|
||||
return 1;
|
||||
if (sample_install_xdp(skel->progs.xdp_router_ipv4_prog,
|
||||
index, generic, force) < 0)
|
||||
goto end_destroy;
|
||||
}
|
||||
|
||||
return 0;
|
||||
if (get_route_table(AF_INET) < 0) {
|
||||
fprintf(stderr, "Failed reading routing table\n");
|
||||
goto end_destroy;
|
||||
}
|
||||
|
||||
if (get_arp_table(AF_INET) < 0) {
|
||||
fprintf(stderr, "Failed reading arptable\n");
|
||||
goto end_destroy;
|
||||
}
|
||||
|
||||
ret = sample_run(interval, monitor_route, NULL);
|
||||
if (ret < 0) {
|
||||
fprintf(stderr, "Failed during sample run: %s\n", strerror(-ret));
|
||||
ret = EXIT_FAIL;
|
||||
goto end_destroy;
|
||||
}
|
||||
ret = EXIT_OK;
|
||||
|
||||
end_destroy:
|
||||
xdp_router_ipv4__destroy(skel);
|
||||
end:
|
||||
sample_exit(ret);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user